Envelop.



No. 716384. Patented Ber: 23, I902.

T. H. DAVIES.

ENVELOP.

(Application filed. Oct. 13. 1902.)

(N0 Mndel.)

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UNITED STATES ATENT FFIcE.

THOMAS H. DAVIES, OF HOMESTEAD, PENNSYLVANIA.

ENVELOP.

SPECIFICATION forming part of Letters Patent No. 716,684, dated December 23, 1902.

Application filed October 13, 1902. Serial No. 127,015. (No model.)

This invention relates to certain new and useful improvements in envelope; and it is the primary object of the invention to construct an envelop which may not be opened or tampered with by unauthorized persons without detection.

To this end the invention resides in the particular construction of the envelop-blank, whereby when it is foided and sealed all edges of the envelop are doubly protected and opening without detection rendered practically impossible.

In describing the invention in detail reference is had to the accompanying drawings, formiuga part of this specification, and wherein like numerals of reference indicate like parts throughout the several views,in which Figure 1 is adetail plan view of the envelopblank before being folded. Fig. 2 is a like view of the blank, showing the first step in the folding operation. Fig. 3 is a plan view showing the second step in the folding operation. Fig. 4 is a plan view of the reverse side of the envelop to that shown in Fig. 3 and illustrating the third step in the folding operation. Fig. 5 is a plan view'of the envelop, showing the reverse side to that shown in Fig. 4: and illustrating the first step in sealing the envelop and after the blank has been formed into an envelop. Fig. 6 is a plan view of the envelop in its sealed form. Fig. 7 is a transverse vertical sectional view of the envelop in its sealed form.

My improved envelop-blank comprisesa front 1 and back 2, which are folded one on the other at the central crease-line 3. The front 1 is provided at each end with sub stantially triangular-shaped flaps 4B, which are produced by cutting substantially V- shaped incisions 5 in the ends of the front 1, the latter to this end being of considerably greater length than the back 2. These flaps 4 4-. are folded over upon the front 1, as shown in Fig. 2 of the drawings, and are provided with gum or other adhesive material on their outer faces, as shown in Fig. 2. Fig. 2 represents the first step in the folding of the blank to form the envelop. When the wings a at are folded over, as shown in this figure, it

will be noted that the back 2 projects at the ends slightly beyond the ends of the front 1, forming sealing-flaps 6, which are gummed on the faces corresponding with the gummed face of the flaps 4. I next fold the rear flap 2 upon top of the flaps 4c and front flap 1, as seen in Fig. 3 of the drawings. I then reverse the envelop, as seen in Fig. 4 of the drawings, and bend over the flap 6, dampening the gum or adhesive surface of the same, so as to cause the same to adhere to the front face of the flap l. The blank is now formed in the envelop ready to receive the letter or other contents. After the letter or other contents has been placed in the envelop I fold down the elongated gummed sealing-flap 7, which is formed integral with the front flap 1, this sealing-flap adhering to the rear face of the rear flap 2 throughout the length of said flap.

The elongated sealing-flap 7 has an extension 8 at one end and an extension 9 of considerably greater length at its other end. After the flap 7 has been sealed onto the back 2 I again reverse the envelop and fold the flap 9 over onto the front flap 1 along the upper edge thereof, having previously dampened the extension 9, so it will adhere to the front 1, and

I then fold the short extension 8 over onto the top of the extension 9, having first dampened the gumrned surface of said extension 8, so it will adhere to the extension 9. At the joint 10 of these two extensions I place the sealingstamp. (Not shown.) It will be observed that with this construction the envelop is doubly sealed at all its edges, each foldedover sealing-flap being held by another sealing-fiap, and the fastening of the stamp upon the joint 10 prevents any opening of the envelop without the removal of the stamp and the mutilating of the envelop in such a manner that detection would be had.

It will furtherbe noted that various changes may be made in the details of construction without departing from the general spiritof my invention.

Having fully described my invention, what I claim as new,and desire to secure by Letters Patent, is

1. An envelop-blank comprisinga front and rear flap, side flaps upon the two side edges of said front flap, being triangular in form,

V-shaped recesses in said front flap formed between the side flaps, adapted to form a rectangular pocket-receptacle upon folding over the side flaps upon the front flap, said rear flap being made shorter than the front flap, sealing-flaps carried thereby on its two side edges, adapted to be sealed upon the front face of the front flap, and an elongated sealing-strip upon the front edge of the front flap, said strip having an elongated extension from one end of said flap and a shorter extension from the other, said extensions adapted to overlap to secure the rear flap upon the main portion of said sealing-strip, substantially as described.

2. An envelop-blank comprisingafrontand rear flap, adhesive sealing-flaps upon the ends of the latter, two triangular sealing-flaps arranged on each side edge of the front flap, V- shaped recesses between each pair of said triangular sealing flaps, adapted to form a pocket-receptacle on said front flap upon folding the same, the rear flap adapted to fold over the front flap and be secured thereto by its sealing-flap, and an elongated sealing-flap upon the front flap extending beyond said flap and adapted to fold over in overlapped position to secure the front edge of the rear flap, substantially as described.

In testimony whereof I affix my signature in the presence of two witnesses.

THOMAS H. DAVIES.

Witnesses:

A. M. WILSON, JOHN GRAEBING, Jr. 

